[DonVoigt]

I think it looks fine.
You really can't put "back" metal removed in buffing.

Re-heat the spring-
polish it white, then heat just to achieve the blue, quench immediately. Don't go any farther and you won't change the spring's "springiness". But be very careful, the thin spring will go from white to straw and past blue in an instant- really should be done in a controlled oven/furnace- your kitchen stove won't get hot enough.